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Claude Opus 4.5 vs GPT-4.1 Nano

Claude Opus 4.5 leads GPT-4.1 Nano on the Artificial Analysis Intelligence Index, 29.1 to 7.8, and GPT-4.1 Nano costs 62.5x less per output token ($0.40 vs $25.00 per million). Updated October 22, 2026; 64 benchmarks have a result for both.

Replace Claude Opus 4.5 Replace GPT-4.1 Nano
Claude Opus 4.5Anthropic
Coding
44.0
Overall
55.7
Output $/M
$25.00
64
GPT-4.1 NanoOpenAI
Coding
No data
Overall
24.7
Output $/M
$0.40
0
vs boards won of 64 shared

Claude Opus 4.5 or GPT-4.1 Nano: which to pick

Only Claude Opus 4.5 has a coding score, 44.0 on the Vibe Coding Index; GPT-4.1 Nano has none, so the two cannot be ranked on coding.

Pick GPT-4.1 Nano for output tokens 62.5x cheaper ($0.40 vs $25.00 per million) and a larger context window (1.05M against 200K tokens).

Model AClaude Opus 4.5Anthropic44.0/1003 independent benchmarks$1.37 per solved taskModel BGPT-4.1 NanoOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
64
Claude Opus 4.5 only
44
GPT-4.1 Nano only
7
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Claude Opus 4.5 44.0 from 3 benchmarks, GPT-4.1 Nano not benchmarked.
Widest category
Agentic work, 58.3 points apart on average over 2 shared benchmarks.
Widest single gap
ARC-AGI: Claude Opus 4.5 80.0% against GPT-4.1 Nano 0.0%, 80.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.5 $25.00 against GPT-4.1 Nano $0.40 per million output tokens, 62.5x apart.
Context window
Claude Opus 4.5 takes 200K tokens, GPT-4.1 Nano 1.05M.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryClaude Opus 4.5BarsGPT-4.1 NanoTies
Coding60
Intelligence20
Agentic work20
Reasoning120
Math70
Knowledge120
Web design60
General170
All shared boards640
CodingLike-for-likeSix of these boards feed the Vibe Coding Index60
Coding benchmarks for Claude Opus 4.5 and GPT-4.1 Nano
BenchmarkClaude Opus 4.5GPT-4.1 NanoLeader
Aider polyglotNot measured8.9%Only GPT-4.1 Nano measured
SWE-bench Verified79.2%Not measuredOnly Claude Opus 4.5 measured
SWE-bench (full test set)52.6%Not measuredOnly Claude Opus 4.5 measured
SWE-bench Multilingual70.7%Not measuredOnly Claude Opus 4.5 measured
LMArena WebDev1494Not measuredOnly Claude Opus 4.5 measured
AA Coding IndexNot measured11.1Only GPT-4.1 Nano measured
LiveCodeBench (Vals AI)83.7%42.7%Claude Opus 4.5
SWE-bench Verified (Vals AI)76.4%Not measuredOnly Claude Opus 4.5 measured
Vibe Code Bench (Vals AI)20.6%Not measuredOnly Claude Opus 4.5 measured
LiveCodeBench (Artificial Analysis run)87.1%32.6%Claude Opus 4.5
Terminal-Bench Hard (Artificial Analysis run)47.0%3.8%Claude Opus 4.5
Terminal-Bench63.1%Not measuredOnly Claude Opus 4.5 measured
GSO-Bench26.5%Not measuredOnly Claude Opus 4.5 measured
WeirdML63.7%19.0%Claude Opus 4.5
Cybench82.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: coding15031306Claude Opus 4.5
LMArena Text: software and IT14831305Claude Opus 4.5
LMArena WebDev: React1478Not measuredOnly Claude Opus 4.5 measured
LMArena WebDev: HTML1510Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 20 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 4.5 and GPT-4.1 Nano
BenchmarkClaude Opus 4.5GPT-4.1 NanoLeader
AA Intelligence Index29.17.8Claude Opus 4.5
Epoch Capabilities Index150.1129.5Claude Opus 4.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
Agentic work benchmarks for Claude Opus 4.5 and GPT-4.1 Nano
BenchmarkClaude Opus 4.5GPT-4.1 NanoLeader
Design Arena: agents building web apps1159Not measuredOnly Claude Opus 4.5 measured
Design Arena: agents building full-stack apps1156Not measuredOnly Claude Opus 4.5 measured
Design Arena: agents building mobile apps1189Not measuredOnly Claude Opus 4.5 measured
Design Arena: agents building Android apps1176Not measuredOnly Claude Opus 4.5 measured
τ²-Bench Telecom89.5%17.3%Claude Opus 4.5
METR time horizons75.0%Not measuredOnly Claude Opus 4.5 measured
Remote Labor Index3.8%Not measuredOnly Claude Opus 4.5 measured
GDPval45.5%Not measuredOnly Claude Opus 4.5 measured
BALROG43.5%Not measuredOnly Claude Opus 4.5 measured
DeepResearch Bench54.8%Not measuredOnly Claude Opus 4.5 measured
OSWorld66.3%Not measuredOnly Claude Opus 4.5 measured
Vending-Bench 2$4,967Not measuredOnly Claude Opus 4.5 measured
Berkeley Function Calling Leaderboard (BFCL)77.5%33.1%Claude Opus 4.5
Neither model has a result on the other 28 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index120
Reasoning benchmarks for Claude Opus 4.5 and GPT-4.1 Nano
BenchmarkClaude Opus 4.5GPT-4.1 NanoLeader
GPQA Diamond85.9%50.8%Claude Opus 4.5
MMMU Pro (Vals AI)83.0%55.0%Claude Opus 4.5
GPQA Diamond (Artificial Analysis run)86.6%51.2%Claude Opus 4.5
Humanity's Last Exam (Artificial Analysis run)30.1%3.8%Claude Opus 4.5
GPQA Diamond (Epoch AI run)86.0%48.9%Claude Opus 4.5
ARC-AGI80.0%0.0%Claude Opus 4.5
ARC-AGI-237.6%0.0%Claude Opus 4.5
SimpleBench62.0%Not measuredOnly Claude Opus 4.5 measured
Chess puzzles14.0%0.0%Claude Opus 4.5
Mystery game puzzles22.0%Not measuredOnly Claude Opus 4.5 measured
EBR-bench14.3%Not measuredOnly Claude Opus 4.5 measured
VPCT40.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: hard prompts14761286Claude Opus 4.5
LMArena Text: expert14871271Claude Opus 4.5
LMArena Text: hard prompts in English14821293Claude Opus 4.5
Kagi LLM Benchmark80.2%33.3%Claude Opus 4.5
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index70
Math benchmarks for Claude Opus 4.5 and GPT-4.1 Nano
BenchmarkClaude Opus 4.5GPT-4.1 NanoLeader
AIME95.4%26.5%Claude Opus 4.5
MATH 500 (Vals AI)Not measured80.2%Only GPT-4.1 Nano measured
MGSM (Vals AI)95.2%69.3%Claude Opus 4.5
AA Math Index91.324.0Claude Opus 4.5
AIME 2025 (Artificial Analysis run)91.3%24.0%Claude Opus 4.5
OTIS Mock AIME86.1%28.9%Claude Opus 4.5
FrontierMath, tiers 1 to 334.4%Not measuredOnly Claude Opus 4.5 measured
FrontierMath, tier 44.9%Not measuredOnly Claude Opus 4.5 measured
ProofBench36.0%Not measuredOnly Claude Opus 4.5 measured
MATH level 5Not measured70.0%Only GPT-4.1 Nano measured
LMArena Text: math14631274Claude Opus 4.5
LMArena Text: mathematical work14681274Claude Opus 4.5
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index120
Knowledge benchmarks for Claude Opus 4.5 and GPT-4.1 Nano
BenchmarkClaude Opus 4.5GPT-4.1 NanoLeader
MMLU Pro87.3%63.5%Claude Opus 4.5
LegalBench (Vals AI)84.6%61.1%Claude Opus 4.5
CaseLaw (Vals AI)62.6%Not measuredOnly Claude Opus 4.5 measured
CorpFin (Vals AI)65.1%42.1%Claude Opus 4.5
TaxEval (Vals AI)74.9%60.8%Claude Opus 4.5
MortgageTax (Vals AI)68.7%52.8%Claude Opus 4.5
MedQA (Vals AI)95.9%68.2%Claude Opus 4.5
MedCode (Vals AI)49.2%Not measuredOnly Claude Opus 4.5 measured
MMLU Pro (Artificial Analysis run)89.5%65.7%Claude Opus 4.5
SimpleQA Verified45.7%6.0%Claude Opus 4.5
GeoBench75.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: science14541297Claude Opus 4.5
LMArena Text: medicine and healthcare14441276Claude Opus 4.5
LMArena Text: legal and government14591300Claude Opus 4.5
LMArena Text: business and finance14481267Claude Opus 4.5
FACTS Benchmark Suite43.9%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for Claude Opus 4.5 and GPT-4.1 Nano
BenchmarkClaude Opus 4.5GPT-4.1 NanoLeader
Design Arena: websites1247972Claude Opus 4.5
Design Arena: UI components1235913Claude Opus 4.5
Design Arena: game dev1228970Claude Opus 4.5
Design Arena: data viz1243891Claude Opus 4.5
Design Arena: 3D1213924Claude Opus 4.5
Design Arena: all code categories1242962Claude Opus 4.5
Design Arena: SVG1180Not measuredOnly Claude Opus 4.5 measured
Design Arena: ASCII art1190Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index170
General benchmarks for Claude Opus 4.5 and GPT-4.1 Nano
BenchmarkClaude Opus 4.5GPT-4.1 NanoLeader
SAGE (Vals AI)52.1%Not measuredOnly Claude Opus 4.5 measured
MedScribe (Vals AI)85.3%Not measuredOnly Claude Opus 4.5 measured
IFBench58.0%32.0%Claude Opus 4.5
Long context reasoning (AA-LCR)77.3%20.3%Claude Opus 4.5
DTBench89.9%52.5%Claude Opus 4.5
LMCA44.5%5.5%Claude Opus 4.5
Fiction.LiveBenchNot measured25.0%Only GPT-4.1 Nano measured
CL-bench21.1%Not measuredOnly Claude Opus 4.5 measured
Furniture assembly28.3%Not measuredOnly Claude Opus 4.5 measured
LMArena Text14511285Claude Opus 4.5
LMArena Text: instruction following14781266Claude Opus 4.5
LMArena Text: creative writing14451260Claude Opus 4.5
LMArena VisionNot measured1063Only GPT-4.1 Nano measured
LMArena Text: English14611303Claude Opus 4.5
LMArena Text: non-English14381260Claude Opus 4.5
LMArena Text: Chinese14701270Claude Opus 4.5
LMArena Text: German14491288Claude Opus 4.5
LMArena Text: Japanese14171198Claude Opus 4.5
LMArena Text: Korean1424Not measuredOnly Claude Opus 4.5 measured
LMArena Text: French1471Not measuredOnly Claude Opus 4.5 measured
LMArena Text: Spanish1457Not measuredOnly Claude Opus 4.5 measured
LMArena Text: Russian14471261Claude Opus 4.5
LMArena Text: Polish1439Not measuredOnly Claude Opus 4.5 measured
LMArena Text: multi-turn14661277Claude Opus 4.5
LMArena Text: longer queries14791283Claude Opus 4.5
LMArena Text: writing and language14521261Claude Opus 4.5
LMArena Text: entertainment and media14341243Claude Opus 4.5
LMArena Vision: EnglishNot measured1101Only GPT-4.1 Nano measured
LMArena Document1462Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 17 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.5 and GPT-4.1 Nano
BenchmarkClaude Opus 4.5GPT-4.1 NanoLeader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Claude Opus 4.5$0.018Fits in one request
GPT-4.1 Nano$0.0003Fits in one request

GPT-4.1 Nano costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.5$0.325Fits in one request
GPT-4.1 Nano$0.0062Fits in one request

GPT-4.1 Nano costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.5$1.25Exceeds the context window
GPT-4.1 Nano$0.024Fits in one request

GPT-4.1 Nano costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Claude Opus 4.5 and GPT-4.1 Nano
SpecificationAnthropic Claude Opus 4.5OpenAI GPT-4.1 Nano
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedNovember 24, 2025April 14, 2025
Context window200K1.05M
Input $/Mtok$5.00$0.10
Output $/Mtok$25.00$0.40
Coding index44.0Not benchmarked
Independent measurements behind it30
Cost per solved task$1.37Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.5 better than GPT-4.1 Nano for coding?

Only Claude Opus 4.5 has a coding score, 44.0 on the Vibe Coding Index; GPT-4.1 Nano has none, so the two cannot be ranked on coding. Pick GPT-4.1 Nano for output tokens 62.5x cheaper ($0.40 vs $25.00 per million) and a larger context window (1.05M against 200K tokens).

Which is cheaper, Claude Opus 4.5 or GPT-4.1 Nano?

Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; GPT-4.1 Nano costs $0.10 and $0.40. Cost per solved task is known for Claude Opus 4.5 only.

Which has the bigger context window, Claude Opus 4.5 or GPT-4.1 Nano?

GPT-4.1 Nano, with 1.05M tokens against 200K.

How many benchmarks is the Claude Opus 4.5 vs GPT-4.1 Nano comparison based on?

64 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.5's coding index rests on 3 independent benchmarks and GPT-4.1 Nano's on 0. Where only one model has a result, the page says so instead of naming a winner.

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